No, apparently Martin WAS the thug in this case. Hey look, if you want to let your neighborhood go to hell while hiding in your house.... that's fine. I am just saying Mr. Z actually tried to do something. Don't make this a black/white thing, make it a man trying to do good thing.
Calling the cops IS doing something if you suspect that somebody is doing something wrong. When the cops tell you not to follow and you do anyway, you're not a hero. You're not helping. You're being a stalking harassing hindrance. A moron with hero delusions is a menace to society.